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Does anyone know the minimum curve that the gunderson maxi cars can be run on I have a transitional curve where the very middle is 9" then easing out to about 15" I would like to know if they would go round it?

With something articulated like those, the consistency of the radius is probably more important than the actual radius. Having a very sharp bit in an otherwise gradual curve is probably more of a problem than a well laid 9" curve.